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Thread: My modulus result is wrong.

  1. #1
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    Default My modulus result is wrong.

    Hi Java professionals,
    my remainder result is always wrong and I cannot understand why. The following is my code,please help,many thanks in advance.


    import java.awt.*;
    import javax.swing.*;
    import java.awt.event.*;
    public class Question extends JFrame implements ActionListener
    {
        private JLabel amt,dollar,fifty,title,result,error,creator;
        private TextField tb1,tb2,tb3;
        private JButton count;
        public Question()
        {
            setSize(400,300);
            JPanel contentPane = new JPanel(null);
            contentPane.setBorder(BorderFactory.createLineBorder(Color.gray));
            setContentPane(contentPane);
            count = new JButton("=");
            title = new JLabel("Calculate Change");
            amt = new JLabel("Enter the amount:");
            dollar = new JLabel("1 Dollar Coin:");
            fifty = new JLabel("50 Cent Coin:");
            error = new JLabel("wrong information.");
            creator = new JLabel("Created by ?????");
            Font bold = new Font("Arial",Font.BOLD,15);
            Font wrong = new Font("Arial",Font.ITALIC,12);
            Font smaller = new Font("Arial",Font.ITALIC,10);
            error.setForeground(Color.red);
            tb1 = new TextField(13);
            tb2=new TextField(12);
            tb3= new TextField(12);
            tb2.setEnabled(false);
            tb3.setEnabled(false);
            creator.setFont(smaller);
            error.setFont(wrong);
            title.setFont(bold);
            title.setBounds(130,-14,150,40);
            amt.setBounds(20, 20, 120, 20);
            dollar.setBounds(40, 45, 120, 20);
            fifty.setBounds(40, 70, 120, 20);
            tb1.setBounds(160, 21, 90, 24);
            tb2.setBounds(160, 45, 90, 20);
            tb3.setBounds(160, 70, 90, 20);
            error.setBounds(260,170,150,20);
            count.setBounds(100,200,90,20);
            creator.setBounds(240,220,180,20);
            contentPane.add(title);
            contentPane.add(amt);
            contentPane.add(dollar);
            contentPane.add(fifty);
            contentPane.add(tb1);
            contentPane.add(tb2);
            contentPane.add(tb3);
            contentPane.add(error);
            contentPane.add(creator);
            contentPane.add(count);
            count.addActionListener(this);
        }
     
        public void actionPerformed(ActionEvent e)
        {
            try
            {
                //String input = tb1.getText();
                double convert = Double.parseDouble(tb1.getText());
                if((e.getSource() == count) && (convert >=1)) 
                {
                    double result;
                    result = convert /1;
                    convert = convert % 1;
                   int result2 = (int)result;
                    String result3 = String.valueOf(result2);
                    tb2.setText(result3);
     
                }
                if((convert >= 0.5) && (convert < 0.99))
                {
                    tb3.setText("1");
                    convert = convert % 0.5;
                      String result4 = String.valueOf(convert);
                    error.setText(result4);
                }
               }catch(Exception ex)
            {
                error.setText("Invalid input.");
            }
        }
     
        public static void main(String []args)
        {
            Question frame = new Question();
            frame.setVisible(true);
        }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: My modulus result is wrong.

    Please post the code's output that shows the problem.
    What values are not being computed like you expect?
    Give some examples of the input to the program and the program's output.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: My modulus result is wrong.

    Are you sure you're using the modulus operator like you expect?
    convert = convert % 1;
    after this statement convert will always equal 1 such that convert >= 1
    When convert is < 1 convert will equal the original number

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